How to call the function inside the popup window

hello, after i select the word i want, there will be a popup window.
And now i want to change the window into a panel i create, but i have no idea about how to call those function inside the original window. (Those functions are here : 「Copy text to clipboard」, 「Highlight texts」, 「Underline」, 「StrikeOut」 and 「Squiggly」)
Can anyone give me some suggestions? please.
The version i use is free version.

More specifically, whether i can edit the popup window, how to do it ? please.

free version (non license actived) has no these feature.
and the demo project(package name not changed) shall has these feature.

Hi,

in iOS version you can edit the PopupMenu loading in ViewDidLoad method of RDPDFViewController class.
If you want to change this implementation, you can remove the popup menu and insert you personal panel implementation.